Use generated Neon version of MemCopy() on ARM, if platform supports it.

src/platform-linux.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 138 matching lines @@
       break;
     case VFP3:
       search_string = "vfpv3";
       break;
     case ARMv7:
       search_string = "ARMv7";
       break;
     case SUDIV:
       search_string = "idiva";
       break;
+    case NEON:
+      search_string = "neon";
+      break;
     case VFP32DREGS:
       // This case is handled specially below.
       break;
     default:
       UNREACHABLE();
   }
 
   if (feature == VFP32DREGS) {
     return ArmCpuHasFeature(VFP3) && !CPUInfoContainsString("d16");
   }
@@ skipping 1156 matching lines @@
 
 
 void Sampler::Stop() {
   ASSERT(IsActive());
   SignalSender::RemoveActiveSampler(this);
   SetActive(false);
 }
 
 
 } }  // namespace v8::internal